Piston



- July 23, 1940. J WQRKMAN 2,208,782

PISTON Filed Feb. 2a, 1939 172221266 wrlvnan/ Patented July 23, 1940 UNITED STATES PATENT OFFICE PISTON Application February 28, 1939, Serial No. 259,032

1 Claim. (01. 309- This invention relates to a piston, operating in a cylinder, the general object of the invention being to provide yieldable means for holding the piston in perpendicular position in the cylinder, 5 so as to prevent piston slap, wear, waste of oil and fuel and otherwise make the engine more eflicient.

The invention also consists in certain other features of construction, combination and arrangement of several parts to be hereinafter fully,described, illustrated in the accompanying drawing and specifically pointed out in the appended claim.

In describing the invention in detail, reference 7 will be had to the accompanying drawing wherein like characters denote like or corresponding parts throughout the several views, and in which:

Fig. 1 is an elevation of a piston constructed in accordance with this invention.

Fig. 2 is a section on line 2-2 of Fig. 1.

Fig. 31s a section on line 3-3 of Fig. 2.

In these views, the piston is shown at A and a portion of the cylinder at B. In carrying out the invention, a pair of vertically arranged grooves I is formed in the piston, at diametrically located points on the exterior walls thereof. Each groove terminates a distance from each end of the piston and a pair of holes 2 are formed in the piston at the ends of each groove. Cupshaped members are held in these holes, as shown at 3, the outer end of each-cup being flush with the bottom wall of the groove. A pair of striplike members 4 is located in the grooves and each member has an inwardly extending socket memher 5 at each end thereof, which has a sliding fit in a cup-shapedmember. A spring 6 is located in each space formed by a socket member and a cup-shaped member and these springs tend to force the members l outwardly into contact with the walls of the cylinder. The members 4 are of less area than the grooves and have their outer faces somewhat rounded to conform with the curvature of the cylinder walls. The members are located below the oil rings of the piston so that oil from the crank-case can readilyreach the parts of the invention to lubricate the same. These spring pressed members will act to hold the piston in perpendicular position, thus avoiding piston-slap, undue wear of the piston, the cylinder walls and the rings. The members 4 are made of metal which is softer than that composing the cylinder block.

This invention makes the engine equipped therewith very efiicient in every respect and obviates reboring of the block.

It is thought from the foregoing description that the advantages and novel features of the invention will be readily apparent.

It is to be understood that changes may be made in the construction, combination and arrangement of the several parts, provided such changes fall within the scope of the appended claim.

What I claim and desire to protect by Letters Patent is:

In a device of the class described, a piston having oppositely disposed vertical grooves in its exterior walls, said grooves communicating at their 7 ends with enlarged substantially circular recesses communicating with centrally disposed holes in the walls of the piston, narrow metal strips loosely seated in the grooves and having enlarged portions of lessdiameter than the aforesaid recess seated therein, inwardly extending sockets formed on the inner sides of the enlarged portions of the metal strips with their inner ends open and protruding through the aforesaid holes, .cupshaped members closely surrounding the inwardly extending sockets, flanges on the cup-shape members seated in the aforesaid recesses and expansion coil springs disposed within the sockets and cup-shaped members.

- JAMES WORKMAN. 

